Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Threaded fastener locked to a discreet structure – Nut – and means to engage substructure on its opposite faces...
Patent
1997-03-31
1998-05-05
Sakran, Victor N.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Threaded fastener locked to a discreet structure
Nut, and means to engage substructure on its opposite faces...
411161, 411959, 24514, F16B 3900, A44B 2100
Patent
active
057465606
ABSTRACT:
A faying plate having a clearance hole is fastened to a tapping plate having a tapping hole by a fastener having a shank with a tapered tip and with a self-tapping thread. The shank, which defines an axis, is adapted to tap a complementary thread around the tapping hole, via the self-tapping thread, when the fastener is driven rotatably. The fastener has a unitary head with a bearing portion having a peripheral edge and a having surface facing the shank, flaring outwardly toward the shank, and frusto-conical at a conical angle of about 5.degree. relative to a plane perpendicular to the axis. Eight torque-absorbing ribs project from the clamping surface, are spaced at regular intervals about the axis, and have ridges that lie on an imaginary, frusto-conical surface flaring outwardly toward the shank at a conical angle of about 1.degree. relative to a plane perpendicular to the axis and at a conical angle of about 4.degree. relative to the clamping surface. Each rib has a depth from not less than 0.0001 inch to about 0.0054 inch at the peripheral edge of the bearing portion.
REFERENCES:
patent: 2147209 (1939-02-01), Olson
patent: 2959204 (1960-11-01), Rigot
patent: 3370631 (1968-02-01), James
patent: 4220188 (1980-09-01), McMurray
patent: 4808050 (1989-02-01), Landt
patent: 5183359 (1993-02-01), Barth
Barth Gerald D.
Bechtel Frank W.
Illinois Tool Works Inc.
Sakran Victor N.
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